Unfortunate for sure. Condolences on your loss. But these things happen and we learn.
. . . of course most of the guy said ...pilot error.lol . . .
When the pilot is the one charging the batteries they were correct.
I suspect a LOT more crashes occur due to low Rx battery than all the true "hits" and component failure combined.
Aileron flutter is another one that goes undiagnosed and hot melt ARF glue is blamed. Not in this case - usally those stories start out "my wing just collapsed all on it's own!"